Permanent deletion of Hard disk

Hi,
Kindly suggest any usefull freeware to completely and permanent deletion of Hard disk and logical partion so that no recovery software be able to recover any sort of data after erasing it.

Regards
Syinfra
syinfraSenior Deputy ManagerAsked:
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skca54Senior EngineerCommented:
Above is only guaranteed solution.
However Ultimate Boot CD has erase utilities: http://www.ultimatebootcd.com/.
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GTPD22Commented:
Are you going to get rid of the hard drive? If so, why not take a drill and drill through it, or take a hammer to it. Im not trying to be funny, but forensic software can bring back just about anything that whas been stored on a hdd.
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Rich RumbleSecurity SamuraiCommented:
Just about any free one will do, UBCD is good (above) and easy, do it twice to be sure. If you can mount the HD as a secondary even windows can do it natively.
cipher /Wd:\*
d: being the drive letter, no space between the W and the drive letter. Run that twice at least.
-rich
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syinfraSenior Deputy ManagerAuthor Commented:
Hi,
I need to reuse the hard disk for some purpose and hence before reassigning the hard disk to user i need to ensure no data can be ever recover through any recovery software or utilities.

Regards
Syinfra
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Rich RumbleSecurity SamuraiCommented:
Once new data is written and remains in place over old data, it's hard to recover without being sent to a specialist recovery agency, and even then it is difficult. This link is the definitive word on data recovery, you can pretty much skip to the bottom and read the conclusions:
http://www.cs.auckland.ac.nz/~pgut001/pubs/secure_del.html
Further Epilogue section contains data contradicting things that another recent paper has made.

I've used all the recovery suites and even special services, the newer, well the larger at any rate, the larger the HD, the harder it is to recover data these days. On-Track software is the best I've used, Spin-Rite comes in second. Again cipher, built into xp and after will do a fine job of wiping, or just about any free utility out there. Using TrueCrypt to encrypt the whole disk is also effective at eliminating previous data, as TC overwrites the data a few times itself.
-rich
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